The Effect of Tropical Sunlight On the Development of Bones of Children in Puerto Rico; a Roentgenographic And Clinical Study of Infants And Young Children With Special Reference to Rickets And Related Factors

Cover The Effect of Tropical Sunlight On the Development of Bones of Children in Puerto Rico; a Roentgenographic And Clinical Study of Infants And Young Children With Special Reference to Rickets And Related Factors
At head of title: United States Department of labor. Frances Perkins, secretary. Children's bureau. Grace Abbott, chief

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